.sidebar{
    width:40px;height:100%;
    background: #444851;
    float: right;
    z-index: 2;
    position: relative;
}
.sidebar .sidebar_content.kf:hover{
    background: #ed145b;
}
.sidebar .sidebar_content .kf{
    wi
    position: absolute;
    top:100px;left:12px;
}